PROCESSING OF ZA-27 BASE COMPOSITES REINFORCED WITH CARBONACEOUS AND β-SiC PARTICLES

摘要

The compocasting of two base ZA particulate composites is described in this paper. The used metallic alloy during the experimentations is known commercially as ZA-27. This alloy was reinforced in one case with calcined fine coke particles with low sulfur content which comes from processes of drying and sifting of hydrocarbon remainders, and in a second case, with fines particles of β-SiC obtained by pyrolysis of rice husk (RH). For pyrolysis and compocasting process a special rheocaster and gas furnace equipment were designed. The variety of parameters related to the process and others related to the used raw materials, made us plan the work statistically with the purpose of reducing the magnitude of experimentation and arriving at the optimization of the pyrolysis of RH and compocasting process. The SEM and micro analysis for the β-SiC and mechanical tests and microscopic observation are reported for both composites.